With cheaper txn fees, Jupiter can be more precise in splitting up (and optimizing) your swap

With 1inch, there's a larger hurdle (higher gas fees) to make splitting up your swap worthwhile

Tangentially, Jupiter also has features like DCA which just aren't feasible on evm based chains due to higher gas fees

As a result, the aggregator (Jupiter) becomes the interface that you interact with more relative to more expensive chains (leading them to be valued more)